I understand what you are wanting to do, but I'm not sure how to do it. Sorry, not a lot of help here. Maybe you could carve a few indentations in the cake and ice w/buttercream? That is what I did on a baseball hat that I needed to make look "worn in". I just carved a few places into the cake and iced them smooth, then covered the rest of the hat in b/c and smoothed. Good luck!